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Suppose that for a function f , the equation f (x) = 0 has exactly one real-number solution. Which of the following statements MUST be

Suppose that for a function f , the equation f (x) = 0 has exactly one real-number solution. Which of the following statements MUST be true?

a. f is linear

b. f(x)> o for all x in the domain of f

c. f has already one real number zero

d. f is an invertible function

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